diff --git a/code/Task/RecoverUploadLocationsHelper.php b/code/Task/RecoverUploadLocationsHelper.php
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@@ -0,0 +1,570 @@
+<?php
+
+namespace SilverStripe\UserForms\Task;
+
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use RuntimeException;
+use SilverStripe\Assets\File;
+use SilverStripe\Assets\Folder;
+use SilverStripe\Core\Config\Configurable;
+use SilverStripe\Core\Convert;
+use SilverStripe\Core\Environment;
+use SilverStripe\Core\Injector\Injector;
+use SilverStripe\Core\Injector\Injectable;
+use SilverStripe\ORM\DataObject;
+use SilverStripe\ORM\Queries\SQLSelect;
+use SilverStripe\Security\InheritedPermissions;
+use SilverStripe\UserForms\Model\EditableFormField;
+use SilverStripe\UserForms\Model\EditableFormField\EditableFileField;
+use SilverStripe\UserForms\Model\Submission\SubmittedForm;
+use SilverStripe\UserForms\Model\Submission\SubmittedFormField;
+use SilverStripe\UserForms\Model\Submission\SubmittedFileField;
+use SilverStripe\UserForms\Model\UserDefinedForm;
+use SilverStripe\Versioned\Versioned;
+
+/**
+ * A helper to recover the UserForm uploads targeting folders incorrectly migrated from Silverstripe CMS 3
+ *
+ * In short, the migrated folders do not have Live version records in the database, as such
+ * all the files uploaded through UserForms EditableFileField end up in a default fallback folder (/Uploads by default)
+ *
+ * If your project has not been migrated from Silverstripe CMS 3, you do not need this helper.
+ * For more details see CVE-2020-9280
+ *
+ * @internal This class is not a part of Silverstripe CMS public API
+ */
+class RecoverUploadLocationsHelper
+{
+    use Injectable;
+    use Configurable;
+
+    private static $dependencies = [
+        'logger' => '%$' . LoggerInterface::class . '.quiet',
+    ];
+
+    /**
+     * @var LoggerInterface
+     */
+    private $logger;
+
+    /**
+     * @var Versioned
+     */
+    private $versionedExtension;
+
+    /**
+     * Whether File class has Versioned extension installed
+     *
+     * @var bool
+     */
+    private $filesVersioned;
+
+    /**
+     * Cache of the EditableFileField versions
+     * 
+     * @var EditableFileField
+     */
+    private $fieldFolderCache = array();
+
+    public function __construct()
+    {
+        $this->logger = new NullLogger();
+
+        // Set up things before going into the loop
+        $this->versionedExtension = Injector::inst()->get(Versioned::class);
+        $this->filesVersioned = $this->versionedExtension->canBeVersioned(File::class);
+    }
+
+    /**
+     * @param LoggerInterface $logger
+     * @return $this
+     */
+    public function setLogger(LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+        return $this;
+    }
+
+    /**
+     * Process the UserForm uplodas
+     *
+     * @return int Number of files processed
+     */
+    public function run()
+    {
+        // Set max time and memory limit
+        Environment::increaseTimeLimitTo();
+        Environment::setMemoryLimitMax(-1);
+        Environment::increaseMemoryLimitTo(-1);
+
+        $this->logger->notice('Begin UserForm uploaded files destination folders recovery');
+
+        if (!class_exists(Versioned::class)) {
+            $this->logger->warning('Versioned extension is not installed. Skipping recovery.');
+            return 0;
+        }
+
+        if (!$this->versionedExtension->canBeVersioned(UserDefinedForm::class)) {
+            $this->logger->warning('Versioned extension is not set up for UserForms. Skipping recovery.');
+            return 0;
+        }
+
+        return $this->process();
+    }
+
+    /**
+     * Process all the files and return the number
+     * 
+     * @return int Number of files processed
+     */
+    protected function process()
+    {
+        // Check if we have folders to migrate
+        $totalCount = $this->getCountQuery()->count();
+        if (!$totalCount) {
+            $this->logger->warning('No UserForm uploads found');
+            return 0;
+        }
+
+        $this->logger->notice(sprintf('Processing %d file records', $totalCount));
+
+        $processedCount = 0;
+        $recoveryCount = 0;
+        $errorsCount = 0;
+
+        // Loop over the files to process
+        foreach($this->chunk() as $uploadRecord) {
+            ++$processedCount;
+
+            $fileId = $uploadRecord['UploadedFileID'];
+            $fieldId = $uploadRecord['FieldID'];
+            $fieldVersion = $uploadRecord['FieldVersion'];
+
+            try {
+                $expectedFolderId = $this->getExpectedUploadFolderId($fieldId, $fieldVersion);
+                if ($expectedFolderId == 0) {
+                    $this->logger->warning(sprintf(
+                        'The upload folder was not set for the file %d, SKIPPING',
+                        $fileId
+                    ));
+                    continue;
+                }
+                $recoveryCount += $this->recover($fileId, $expectedFolderId);
+            } catch (\Exception $e) {
+                $this->logger->error(sprintf('Could not process the file: %d', $fileId), ['exception' => $e]);
+                ++$errorsCount;
+            }
+        }
+
+        // Show summary of results
+        if ($processedCount > 0) {
+            $this->logger->notice(sprintf('%d file records have been processed.', $processedCount));
+            $this->logger->notice(sprintf('%d files recovered', $recoveryCount));
+            $this->logger->notice(sprintf('%d errors', $errorsCount));
+        } else {
+            $this->logger->notice('No files found');
+        }
+
+        return $processedCount;
+    }
+
+    /**
+     * Fetches the EditableFileField version from cache and returns its FolderID
+     * 
+     * @param int $fieldId EditableFileField.ID
+     * @param int EditableFileField Version
+     * 
+     * @return int
+     */
+    protected function getExpectedUploadFolderId($fieldId, $fieldVersion)
+    {
+        // return if cache is warm
+        if (isset($this->fieldFolderCache[$fieldId][$fieldVersion])) {
+            return $this->fieldFolderCache[$fieldId][$fieldVersion]->FolderID;
+        }
+
+        // fetch the version
+        $editableFileField = Versioned::get_version(EditableFileField::class, $fieldId, $fieldVersion);
+
+        // populate the cache
+        $this->fieldFolderCache[$fieldId][$fieldVersion] = $editableFileField;
+
+        return $editableFileField->FolderID;
+    }
+
+    /**
+     * Fetches a Folder by its ID, gracefully handling
+     * deleted folders
+     * 
+     * @param int $id Folder.ID
+     * 
+     * @return Folder
+     * 
+     * @throws RuntimeException when folder could not be found
+     */
+    protected function getFolder($id)
+    {
+        $folder = Folder::get()->byID($id);
+
+        if (!$folder && $this->filesVersioned) {
+            // The folder might have been deleted, let's look up its latest version
+            $folder = Versioned::get_latest_version(Folder::class, $id);
+
+            if ($folder) {
+                $this->logger->warning(sprintf('Restoring (as protected) a deleted folder: "%s"', $folder->Filename));
+                if ($folder->CanViewType === InheritedPermissions::INHERIT) {
+                    // enforce restored top level folders to be protected
+                    $folder->CanViewType = InheritedPermissions::ONLY_THESE_USERS;
+                }
+
+                $folder->publishSingle();
+            }
+        }
+
+        if (!$folder) {
+            throw new RuntimeException(sprintf('Could not fetch the folder with id "%d"', $id));
+        }
+
+        return $folder;
+    }
+
+    /**
+     * Recover an uploaded file location
+     * 
+     * @param int $fileId File.ID
+     * @param int $expectedFolderId ID of the folder where the file should have end up
+     * 
+     * @return int Number of files recovered
+     */
+    protected function recover($fileId, $expectedFolderId)
+    {
+        /* @var File */
+        $draft = null;
+
+        /* @var File */
+        $live = null;
+
+        if ($this->filesVersioned) {
+            $draftVersion = Versioned::get_versionnumber_by_stage(File::class, Versioned::DRAFT, $fileId);
+            $liveVersion = Versioned::get_versionnumber_by_stage(File::class, Versioned::LIVE, $fileId);;
+
+            if ($draftVersion && $draftVersion != $liveVersion) {
+                $draft = Versioned::get_version(File::class, $fileId, $draftVersion);
+            } else {
+                $draft = null;
+            }
+
+            if ($liveVersion) {
+                $live = Versioned::get_version(File::class, $fileId, $liveVersion);
+            }
+        } else {
+            $live = File::get()->byID($fileId);
+        }
+
+        if (!$live) {
+            $this->logger->notice(sprintf('Could not find file with id %d (perhaps it has been deleted)', $fileId));
+            return 0;
+        }
+
+        // Check whether the file has been modified (moved) after the upload
+        if ($live->Version > 1) {
+            if ($live->ParentID != $expectedFolderId) {
+                // The file was updated after upload (perhaps was moved)
+                // We should assume that was intentional and do not process
+                // it, but rather make a warning here
+                $this->logger->notice(sprintf(
+                    'The file was updated after initial upload, skipping! "%s"',
+                    $live->getField('FileFilename')
+                ));
+            }
+
+            // check for residual files in the original folder
+            return $this->checkResidual($fileId, $live, $draft);
+        }
+
+        if ($live->ParentID == $expectedFolderId) {
+            $this->logger->info(sprintf('OK: "%s"', $live->getField('FileFilename')));
+            return 0;
+        }
+
+        $this->logger->warning(sprintf('Found a misplaced file: "%s"', $live->getField('FileFilename')));
+
+        $expectedFolder = $this->getFolder($expectedFolderId);
+
+        if ($draft) {
+            return $this->recoverWithDraft($live, $draft, $expectedFolder);
+        } else {
+            return $this->recoverLiveOnly($live, $expectedFolder);
+        }
+    }
+
+    /**
+     * Handles gracefully a bug in UserForms that prevents
+     * some uploaded files from being removed on the filesystem level
+     * when manually moving them to another folder through CMS
+     *
+     * @see https://github.com/silverstripe/silverstripe-userforms/issues/944
+     * 
+     * @param int $fileId File.ID
+     * @param File $file The live version of the file
+     * @param File|null $draft The draft version of the file
+     * 
+     * @return int Number of files recovered
+     */
+    protected function checkResidual($fileId, File $file, File $draft = null)
+    {
+        if (!$this->filesVersioned) {
+            return 0;
+        }
+
+        $upload = Versioned::get_version(File::class, $fileId, 1);
+
+        if ($upload->ParentID == $file->ParentID) {
+            // The file is published in the original folder, so we're good
+            return 0;
+        }
+
+        if ($draft && $upload->ParentID == $draft->ParentID) {
+            // The file draft is residing in the same folder where it
+            // has been uploaded originally. It's under the draft's control now
+            return 0;
+        }
+
+        $deleted = 0;
+        $dbFile = $upload->File;
+
+        if ($dbFile->exists()) {
+            // Find if another file record refer to the same physical location
+            $another = Versioned::get_by_stage(File::class, Versioned::LIVE, [
+                '"ID" != ?' => $fileId,
+                '"FileFilename"' => $dbFile->Filename,
+                '"FileHash"' => $dbFile->Hash,
+                '"FileVariant"' => $dbFile->Variant
+            ])->exists();
+
+            // A lazy check for draft (no check if we already found live)
+            $another = $another || Versioned::get_by_stage(File::class, Versioned::DRAFT, [
+                '"ID" != ?' => $fileId,
+                '"FileFilename"' => $dbFile->Filename,
+                '"FileHash"' => $dbFile->Hash,
+                '"FileVariant"' => $dbFile->Variant
+            ])->exists();
+
+            if (!$another) {
+                $this->logger->warning(sprintf('Found a residual file on the filesystem, going to delete it: "%s"', $dbFile->Filename));
+                if ($dbFile->deleteFile()) {
+                    $this->logger->warning(sprintf('DELETE: "%s"', $dbFile->Filename));
+                    ++$deleted;
+                } else {
+                    $this->logger->warning(sprintf('FAILED TO DELETE: "%s"', $dbFile->Filename));
+                }
+            }
+        }
+
+        return $deleted;
+    }
+
+    /**
+     * Recover a file with only Live version (with no draft)
+     *
+     * @param File $file the file instance
+     * @param int $expectedFolder The expected folder
+     * 
+     * @return int How many files have been recovered
+     */
+    protected function recoverLiveOnly(File $file, Folder $expectedFolder)
+    {
+        $this->logger->warning(sprintf('MOVE: "%s" to %s', $file->Filename, $expectedFolder->Filename));
+        return $this->moveFileToFolder($file, $expectedFolder);
+    }
+
+    /**
+     * Recover a live version of the file preserving the draft
+     *
+     * @param File $live Live version of the file
+     * @param File $draft Draft version of the file
+     * @param Folder $expectedFolder The expected folder
+     *
+     * @return int How many files have been recovered
+     */
+    protected function recoverWithDraft(File $live, File $draft, Folder $expectedFolder)
+    {
+        $this->logger->warning(sprintf(
+            'MOVE: "%s" to "%s", preserving draft "%s"',
+            $live->Filename,
+            $expectedFolder->Filename,
+            $draft->Filename
+        ));
+
+        $result = $this->moveFileToFolder($live, $expectedFolder);
+
+        // Restore the DB record of the draft deleted after publishing
+        $draft->writeToStage(Versioned::DRAFT);
+
+        // This hack makes it copy the file on the filesystem level.
+        // The file under the Filename link of the draft has been removed
+        // when we published the updated live version of the file.
+        $draft->File->Filename = $live->File->Filename;
+
+        // If the draft parent folder has been deleted (e.g. the draft file was alone there)
+        // we explicitly restore it here, otherwise it
+        // will be lost and saved in the root directory
+        $draft->Parent = $this->getFolder($draft->ParentID);
+
+        // Save the draft and copy over the file from the Live version
+        // on the filesystem level
+        $draft->write();
+
+        return $result;
+    }
+
+    protected function moveFileToFolder(File $file, Folder $folder)
+    {
+        $file->Parent = $folder;
+        $file->write();
+        $file->publishSingle();
+
+        return 1;
+    }
+
+    /**
+     * Split queries into smaller chunks to avoid using too much memory
+     * @param int $chunkSize
+     * @return Generator
+     */
+    private function chunk($chunkSize = 100)
+    {
+        $greaterThanID = 0;
+
+        do {
+            $count = 0;
+
+            $chunk = $this->getQuery()
+                ->setLimit($chunkSize)
+                ->addWhere([
+                    '"SubmittedFileFieldTable"."UploadedFileID" > ?' => $greaterThanID
+                ])->execute();
+
+            // TODO: Versioned::prepopulate_versionnumber_cache
+
+            foreach ($chunk as $item) {
+                yield $item;
+                $greaterThanID = $item['UploadedFileID'];
+                ++$count;
+            }
+        } while ($count > 0);
+    }
+
+    /**
+     * Returns SQLQuery instance
+     *
+select
+    SubmittedFileField.UploadedFileID,
+    EditableFileField_Versions.RecordID as FieldID,
+    MAX(EditableFileField_Versions.Version) as FieldVersion
+from
+    SubmittedFileField
+left join
+    SubmittedFormField
+on
+    SubmittedFormField.ID = SubmittedFileField.ID
+left join
+    SubmittedForm
+on
+    SubmittedForm.ID = SubmittedFormField.ParentID
+left join
+    EditableFormField_Versions
+on
+    EditableFormField_Versions.ParentID = SubmittedForm.ParentID
+and
+    EditableFormField_Versions.Name = SubmittedFormField.Name
+and
+    EditableFormField_Versions.LastEdited < SubmittedForm.Created
+inner join
+    EditableFileField_Versions
+on
+    EditableFileField_Versions.RecordID = EditableFormField_Versions.RecordID
+and
+    EditableFileField_Versions.Version = EditableFormField_Versions.Version
+where
+    SubmittedFileField.UploadedFileID != 0
+group by
+    SubmittedFileField.UploadedFileID,
+    EditableFileField_Versions.RecordID
+order by
+    SubmittedFileField.UploadedFileID
+limit 100
+     */
+    private function getQuery()
+    {
+        $schema = DataObject::getSchema();
+        $submittedFileFieldTable = $schema->tableName(SubmittedFileField::class);
+        $submittedFormFieldTable = $schema->tableName(SubmittedFormField::class);
+
+        $submittedFormTable = $schema->tableName(SubmittedForm::class);
+
+        $editableFileFieldTable = $schema->tableName(EditableFileField::class);
+        $editableFileFieldVersionsTable = sprintf('%s_Versions', $editableFileFieldTable);
+
+        $editableFormFieldTable = $schema->tableName(EditableFormField::class);
+        $editableFormFieldVersionsTable = sprintf('%s_Versions', $editableFormFieldTable);
+
+        return SQLSelect::create()
+            ->setSelect([
+                '"SubmittedFileFieldTable"."UploadedFileID"',
+                '"EditableFileFieldVersions"."RecordID" as "FieldID"',
+                'MAX("EditableFileFieldVersions"."Version") as "FieldVersion"'
+            ])
+            ->setFrom(sprintf('%s as "SubmittedFileFieldTable"', Convert::symbol2sql($submittedFileFieldTable)))
+            ->setWhere([
+                '"SubmittedFileFieldTable"."UploadedFileID" != 0'
+            ])
+            ->setGroupBy([
+                '"SubmittedFileFieldTable"."UploadedFileID"',
+                '"EditableFileFieldVersions"."RecordID"'
+            ])
+            ->addLeftJoin(
+                $submittedFormFieldTable,
+                '"SubmittedFormFieldTable"."ID" = "SubmittedFileFieldTable"."ID"',
+                'SubmittedFormFieldTable'
+            )
+            ->addLeftJoin(
+                $submittedFormTable,
+                '"SubmittedFormTable"."ID" = "SubmittedFormFieldTable"."ParentID"',
+                'SubmittedFormTable'
+            )
+            ->addLeftJoin(
+                $editableFormFieldVersionsTable,
+                sprintf(
+                    '%s AND %s AND %s',
+                    '"EditableFormFieldVersions"."ParentID" = "SubmittedFormTable"."ParentID"',
+                    '"EditableFormFieldVersions"."Name" = "SubmittedFormFieldTable"."Name"',
+                    '"EditableFormFieldVersions"."LastEdited" < "SubmittedFormTable"."Created"'
+                ),
+                'EditableFormFieldVersions'
+            )
+            ->addInnerJoin(
+                $editableFileFieldVersionsTable,
+                sprintf(
+                    '%s AND %s',
+                    '"EditableFileFieldVersions"."RecordID" = "EditableFormFieldVersions"."RecordID"',
+                    '"EditableFileFieldVersions"."Version" = "EditableFormFieldVersions"."Version"'
+                ),
+                'EditableFileFieldVersions'
+            )
+            ->addOrderBy('"SubmittedFileFieldTable"."UploadedFileID"', 'ASC')
+        ;
+    }
+
+    /**
+     * Returns DataList object containing every
+     * uploaded file record
+     * 
+     * @return DataList
+     */
+    private function getCountQuery()
+    {
+        return SubmittedFileField::get()->filter(['UploadedFileID:NOT' => 0]);
+    }
+}
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